McQuay Enfinity CRH, Enfinity CRW, Enfinity CCH, Enfinity CCW Installation Manual

®

Installation & Maintenance Data

McQuay® Enfinity™ (R-410A) and Standard (R-22)
Horizontal Water Source Heat Pumps

Model CRH, CRW Unit Sizes 007 – 070 / R-22 Refrigerant
Model CCH, CCW Unit Sizes 007 – 060 / R-410A Refrigerant

IM 742-4

Group: WSHP

Part Number: 106586605

Date: September 2007

Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Transportation & Storage

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Cleaning & Flushing System . . . . . . . . . . . . . . . . . . . . .

Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Typical Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . .9-11

©2007 McQuay International

. . . . . . . . . . . . . . . . . . . . . . . . 2

Contents

Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-14

Thermostat Connections . . . . . . . . . . . . . . . . . . . . .16-17

Options for Mark IV/AC Units. . . . . . . . . . . . . . . . . .18-21

Field Installed Options on MicroTech Units . . . . . . . . . 22

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . 23

6

Troubleshooting WSHP . . . . . . . . . . . . . . . . . . . . . .24-25

Troubleshooting Refrigeration Circuit. . . . . . . . . . . . . . 25

Typical Refrigeration Cycles. . . . . . . . . . . . . . . . . . . . . 26

General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Model Nomenclature

Note: For illustration purposes only. Not all options available with all models.

Please consult McQuay Sales Representative for specific availability.

W CCH 1 009 M E Y L S

Product Catagory

W = WSHP

Product Identifier
CCH = Ceiling Mounted / R-410A / Standard Range
CCW = Ceiling Mounted / R-410A / Geothermal
CRH = Ceiling Mounted / R-22 / Standard
CRW = Ceiling Mounted / R-22 / Geothermal

Design Series

1 = A Design
2 = B Design
3 = C Design
4 = D Design

Nominal Capacity

007 = 7,000 030 = 30,000
009 = 9,000 036 = 36,000
012 = 12,000 042 = 42,000
015 = 15,000 048 = 48,000
019 = 19,000 060 = 60,000
024 = 24,000 070 = 70,000

Controls
M = Mark IV
K = Micortech 2000 w/LonMark® 3.3
L = Microtech 2000 w/LonTaLk
A = BACnet
E = Less Board

®

Note: Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations, and are
experienced with this type of equipment. Caution: Sharp edges are a potential injury hazard. Avoid contact with them.

Discharge Air

S = Straight
E = End

Return Air

L = Left
R = Right

Future

(None)

Voltage

A = 115/60/1
E = 208-230/60/1
F = 208-230/60-/3
J = 277-265/60/1
K = 460/60/3
L = 575/60/3

50 Hz (CCH&CCW Only)

M = 230/50/1
N = 380/50/3

Transportation & Storage

Upon receipt of the equipment, check carton for visible
damage. Make a notation on the shipper’s delivery ticket
before signing. If there is any evidence of rough handling,
immediately open the cartons to check for concealed dam­age. If any damage is found, notify the carrier within 48
hours to establish your claim and request their inspection
and a report. The Warranty Claims Department should then
be contacted.
Do not stand or transport the machines on end. For stor
ing, each carton is marked with “up” arrows.

Installation

General

1. To prevent damage, this equipment should not be oper­ated for supplementary heating and cooling during the
construction period.

-2. Inspect the carton for any specific tagging numbers
indicated by the factory per a request from the installing
contractor. At this time the voltage, phase and capacity
should be checked against the plans.

3. Check the unit size against the plans to ensure unit
installation is in the correct location.

4. After removing the carton, remove the hanger kit from
the fan housing.

5. Before installation, check the available ceiling height
versus the height of the unit.

6. Note the location and routing of water piping, conden
sate drain piping, and electrical wiring. The locations of
these items are clearly marked on submittal drawings.

7. The installing contractor will find it beneficial to confer
with piping, sheet metal, ceiling and electrical foremen
before installing any conditioners.

In the event that elevator transfer makes up-ended posi­tioning unavoidable, absolutely ensure that the machine is
in the normal upright position for at least 24 hours before
operating.
Temporary storage at the job site must be indoors,
completely sheltered from rain, snow, etc. High or low tem
peratures naturally associated with weather patterns will
not harm the conditioners. Excessively high temperatures,
140°F (60°C) and higher, may deteriorate certain plastic

­materials and cause permanent damage.

NOTE: Check the unit name plate for correct voltage with

the plans before installing the equipment. Also,
make sure all electrical ground connections are
made in accordance with local code.

8. Remove all shipping blocks in the fan wheel.

9. Change the airflow direction from straight discharge to
end discharge or vice versa before the unit is installed
in the ceiling. Refer to the section in this bulletin for
instructions.

10. We recommend that the contractor cover the condi
tioners with plastic film to protect the machines during
finishing of the building. This is critical while spraying
fireproofing material on bar joists, sandblasting, spray
painting and plastering. If plastic film is not available,

-

the shipping carton may be modified to cover the units
during construction.

-

-

Page 2 / IM 742

Unit Location

B

Coil

Airflow

E

C

D

Comp

Control

Box

Fan

Assembly

A

1. Locate the unit in an area that allows for easy removal
of the filter and access panels. Leave a minimum of 18”
of clearance around the heat pump for easy removal,
and to perform routine maintenance, or troubleshooting.
Provide sufficient room to make water, electrical and duct
connections.

2. The contractor should make sure that adequate ceil
ing panel access exists, including clearance for hanger
brackets, duct collars and fittings at water and electrical
connections.

3. Allow adequate room below the unit for a condensate
trap and do not locate the unit above pipes.

4. Each unit is suspended from the ceiling by four threaded
rods. The rods are attached to the unit corners by a hanger
bracket through a rubber isolator.

Caution: Do not use
rods smaller than shown in Figure 1B. The rods must
be securely anchored to the ceiling or to the bar
joists.

5. Each unit is furnished with a hanger kit. The kit is shipped
unassembled and includes hanger brackets, rubber
isolators, washers, bolts and lock washers. Lay out the
threaded rods per the dimension in Figures 1A and 1B.

6. When attaching the hanger rods to the unit, a double nut
is recommended since vibration could loosen a single
nut. The installer is responsible for providing the hex nuts
when installing hanger rods.

7. Leave minimum 3" (76 mm) extra threaded rod below the
double nuts or minimum 3" (76 mm) clearance between
top of unit and ceiling above to facilitate top panel remov­al for servicing.

Filter Access

Each unit is shipped with a filter bracket for side filter remov­al. For bottom removal push the filter up into top bracket to
gain clearance of bottom bracket and remove the filter. Also,
a sheet metal duct filter retainer can be fabricated when
return air duct work is used.

Figure 1A. Hanger bracket detail, sizes 007 thru 070

Figure 1B. Unit sizes 007 thru 070

-

Bolt & Lock
Washer

Hanger Bracket Dimensions

Models CCH & CCW

UNIT DIMENSIONS (INCHES)
SIZE A B C D E

007 – 009 17.5 34 22 34 20
012 17.5 40 22 40 20
019 – 024 17.5 40 22 40 20
030 – 036 18.5 46 23 46 21

042 – 060 25.5 52 30 52 28

UNIT DIMENSIONS (mm)
SIZE A B C D E

007 – 009 445 864 559 864 508
012 445 1016 559 1016 508
019 – 024 445 1016 559 1016 508
030 – 036 470 1168 584 1168 533
042 – 060 648 1321 762 1321 711

Models CRH & CRW

UNIT DIMENSIONS (INCHES)
SIZE A B C D E

007 – 012 17.5 34 22 34 20
015 – 024 17.5 42 22 42 20
030 – 042 18.5 46 23 46 21
048 – 070 25.5 52 30 52 28

3/8" Threaded Rod
(By Others)

Vibration Isolator

Washer

Hex Nuts
(By Others)

UNIT DIMENSIONS (mm)
SIZE A B C D E

007 – 012 445 864 559 864 508
015 – 024 445 1067 559 1067 508
030 – 042 470 1168 584 1168 533
048 – 070 648 1321 762 1321 711

IM 742 / Page 3

Air Discharge Conversion

Unit sizes 007 thru 070 can be shipped as straight discharge
air or end discharge air arrangement. In the event that the
unit needs to be converted from straight discharge to end
discharge:

1. Remove top panel.

2. Remove the access panel to the fan motor. Remove the
piece of insulation at the bottom on the side of the bottom
panel.

3. Remove the fan discharge panel, rotate it 180 degrees,
and move it to the other side. In other words, with straight

Ductwork & Attenuation

Discharge ductwork is normally used with these condition­ers. Return air ductwork may also be required.
All ductwork should conform to industry standards
of good practice as described in the ASHRAE Systems
Guide.
The discharge duct system will normally consist of a
flexible connector at the unit, a transition piece to the full
duct size, a short run of duct, an elbow without vanes, and
a trunk duct teeing into a branch duct with discharge dif­fusers as shown in Figure 2. The transition piece must not
have angles totaling more than 30° or severe loss of air
performance can result. Do not connect the full duct size to
the unit without using a transition piece down to the size of
the discharge collar on the unit. With metal duct material,
the sides only of the elbow and entire branch duct should
be internally lined with acoustic fibrous insulation for sound
attenuation. Glass fiber duct board material is more absorb
ing and may permit omission of the canvas connector.
The ductwork should be laid out so that there is no line of
sight between the conditioner discharge and the distribution
diffusers.

air discharge the housing is bottom horizontal and with
an end discharge the housing is top horizontal.

4. Remove the three bolts holding the fan motor on and
rotate it so that the motor oilers are in the up position.

5. Install insulation base panel below new access panel
location.

6. Reinstall the top panel.

7. Reinstall the piece of insulation and the access panel.

Return air ducts can be brought in through a low side
wall filter-grille and then up through the stud pieces to
a ceiling plenum or through air ceiling filter-grilles. The
ceiling filter-grille must not be placed directly under the
conditioner.
Return air ductwork can be connected to the standard
filter rack. See Figure 3 (side filter removal shown). The filter
rack can be installed for bottom filter removal or side filter
removal by locating the brackets. For side filter removal the
brackets should be located on the bottom, left side, and top.
For bottom filter removal the brackets should be mounted on
the left side top and right side with the spring clips support­ing the filter.
Do not use sheet metal screws directly into the unit cabi
net for connection of supply or return air ductwork, espe­cially return air ductwork which can hit the drain pan or the
air coil.

-

-

Figure 2. Suggested duct layout

Both Sides Internally Lined With
Acoustic Fibrous Glass Insulation

Transformation

Piece

Discharge Collar

On Heat Pump

Suggested Duct Layout For

Multiple Diffuser Application

Heat
Pump

Canvas
Collar

Square Elbow

2x2 Ft.
Diffuser
(Example
Only)

Trunk Duct

Branch Duct
Internally Lined
With Acoustic
Fibrous
Insulation

Ventilation Air

Ventilation may require outside air. The temperature of the
ventilation air must be controlled so that mixture of outside
air and return air entering the conditioner does not exceed
conditioner application limits. It is also typical to close off
the ventilation air system during unoccupied periods (night
setback).

Figure 3. Filter rack/return air duct collar

Standard 1" (25mm)

Optional 2" (51 mm) Rack also
available.

The ventilation air system is generally a separate building
subsystem with distribution ductwork. Simple introduction of
the outside air into each return air plenum chamber reason­ably close to the conditioner air inlet is recommended. Do
not duct outside air directly to the conditioner inlet. Provide
sufficient distance for thorough mixing of outside and return
air. See Operating Limits on page 8.

Page 4 / IM 742

Electrical Data

1. Verify the compatibility between the voltage and phase
of the available power and that shown on the unit serial
plate. Line and low voltage wiring must comply with
local codes or the National Electrical Code, whichever
applies.

7

2. Apply correct line voltage to the unit. A
and/or a 11⁄8" (29 mm) knockout is supplied on the side
of the unit. A disconnect switch near the unit is required
by code. Power to the unit must be sized correctly and
have dual element (Class RK5) fuses or an HACR circuit

All 208-230 volt single-phase and three-phase units are
factory wired for 208 volt operation. For 230 phase opera
tion, the line voltage tap on the 24 volt transformer must be

All fan motors are multi-speed, PSC type with integral
mounting brackets and thermal overload protection. The
motor is isolated from the fan housing for minimum vibration
transmission. Fan motors on 019 thru 070 have a terminal
strip on the motor body for simple motor speed change
without going back to the control box. To change fan motor
speed to high on size 015 through 048, interchange the red
wire with the black wire. For low speed, sizes 012, 024,
030, 036, 042, 060 and 070, interchange the black wire with
the red wire. To change the 460 volt motor from high to low

Figure 4. CCH, CCW, CRH & CRW Sizes 007 thru 070
(Factory wired)

⁄8" (22mm) hole

General

230 Volt Operation

Fan Assembly

breaker for branch circuit overcurrent protection. See the
nameplate for correct ratings.

3. Three phase 50 cycle units, 380/50/3, require a neutral
wire for 230/50/1 power to the fan circuit.

4. Connect the thermostat/subbase wiring with the power
“off ” to the unit.

Field supplied relays installed on the input terminals W1, W2, Y1,

5.

Y2 or G may introduce electrical noise. Never install relay coils in
series with the inputs.

changed. Disconnect and cap the red lead wire and inter­change it with the orange lead wire on the primary of the 24

­volt transformer.

speed, interchange Black and Red wires, then add jumper
between Black and Blue wires. All the fan/motor assemblies
have a removable orifice ring on the housing to accommo­date motor and fan wheel removal without disconnecting the
ductwork. The fan housing protrudes through the cabinet
allowing adequate material for connection of flexible duct.
Each model unit is shipped from the factory for maximum
performance and minimum sound requirements. Fan sound
levels and performance can be affected by external static
pressure.

Figure 4a. CCH, CCW, CRH & CRW Sizes 042 thru 070
(Factory wired, 460 volt motor only)

1. All units should be connected to supply and return pip­ing in a two-pipe reverse return configuration. A reverse
return system is inherently self-balancing and requires
only trim balancing where multiple quantities of units
with different flow and pressure drop characteristics
exist in the same loop. Check for proper water balance
by measuring differential temperature reading across
the water connections. To insure proper water flow, the
differential flow should be 10°F to 14°F (5°C to 8°C) for
units in cooling mode.

A direct return system may also work acceptably, but

proper water flow balancing is more difficult to achieve
and maintain.

2. The piping can be steel, copper or PVC.

3. Supply and return runouts usually join the unit via short
lengths of high pressure flexible hose which are sound
attenuators for both unit operating noise and hydraulic
pumping noise. One end of the hose should have a
swivel fitting to facilitate removal for service. Hard pip

Note: For low speed applications a jumper must be installed between the motor's Black and
Blue terminal.

Piping

4. Some flexible hose threaded fittings are supplied with

5. Supply and return shutoff valves are required at each

6. No unit should be connected to the supply and return

-

ing can also be brought directly to the unit. This option
is not recommended since no vibration or noise attenu­ation can be accomplished. The hard piping must have
unions to facilitate unit removal. See Figure 5 for typical
piping setup.

sealant compound. If not, apply Teflon tape to assure a
tight seal.

conditioner. The return valve is used for balancing and
should have a “memory stop” so that it can always be
closed off but can only be reopened to the proper posi­tion for the flow required.

piping until the water system has been cleaned and
flushed completely. After the cleaning and flushing
has taken place, the initial connection should have
all valves wide open in preparation for water system
flushing.

IM 742 / Page 5

7. Condensate piping can be steel, copper or PVC. Each
unit includes a condensate connection.

8. The condensate disposal piping must be trapped. The
piping must be pitched away from the unit not less than

1

⁄4" per foot. The unit has a 3/4 inch female pipe fitting

on each water source heat pump to accommodate the
condense drain connection. Factory supplied conden
sate hose assemblies have a pipe thread fitting to facili­tate connection of a flexible vinyl or steel braided hose.
A complete copper or PVC condense system can be

used. Union fittings in the copper or PVC lines should
be applied to facilitate removal.

9. Do not locate any point in the drain system above the
drain connection of any unit.

10. Automatic flow controlled devices must not be installed

-

prior to system cleaning and flushing.

11. A high point of the piping system must be vented.

12. Check local code for the need for dielectric fittings.

Figure 5. (Sizes 007 through 070 shown)

Electrical Access Panel

Hanger Kits (4)

Flex Hoses

Return

Riser

Condensate

Riser

Ball

Supply

Riser

Note: Do not overtorque fittings. The maximum torque without damage to fittings is 30 foot pounds. If a torque wrench is not available, use as a rule of thumb,
finger-tight plus one quarter turn.

Valves

Supply Air

Figure 6. Condensate disposal trapping detail

11⁄2"

11⁄2"

(38 mm)

(38 mm)

Optional Field
Installed Vent

1

⁄4" Per Foot

(21 mm Per
Meter)

Cleaning & Flushing System

1. Prior to first operation of any conditioner, the water
circulating system must be cleaned and flushed of all
construction dirt and debris.

If the conditioners are equipped with water shutoff

valves, either electric or pressure operated, the supply
and return runouts must be connected together at each
conditioner location. This will prevent the introduction of
dirt into the unit. See Figure 7.

Figure 7. Supply & return runouts connected together

Return Runout

Supply Runout

Mains

Flexible Hose

Runouts Initially
Connected Together

2. Fill the system at the city water makeup connection with
all air vents open. After filling, close all air vents.

The contractor should start main circulator with the

pressure reducing valve open. Check vents in sequence
to bleed off any trapped air, ensuring circulation through
all components of the system.

Power to the heat rejector unit should be off, and the

supplementary heat control set at 80°F (27°C).

While circulating water, the contractor should check

and repair any leaks in the piping. Drains at the lowest
point(s) in the system should be opened for initial flush
and blowdown, making sure city water fill valves are set
to make up water at the same rate. Check the pressure
gauge at pump suction and manually adjust the makeup
to hold the same positive steady pressure both before
and after opening the drain valves. Flush should continue
for at least two hours, or longer if required, to see clear,
clean drain water.

3. Shut off supplemental heater and circulator pump and
open all drains and vents to completely drain down the
system. Short circuited supply and return runouts should
now be connected to the conditioner supply and return
connections. Do not use sealers at the swivel flare con
nections of hoses.

4. Trisodium phosphate was formerly recommended as a
cleaning agent during flushing. However, many states
and localities ban the introduction of phosphates into
their sewage systems. The current recommendation is to
simply flush longer with warm 80°F (27°C) water.

-

Page 6 / IM 742

5. Refill the system with clean water. Test the water using
litmus paper for acidity, and treat as required to leave the
water slightly alkaline (pH 7.5 to 8.5). The specified per
centage of antifreeze may also be added at this time. Use
commercial grade antifreeze designed for HVAC systems
only. Do not use automotive grade antifreeze.

Once the system has been filled with clean water

and antifreeze (if used), precautions should be taken
to protect the system from dirty water conditions. Dirty
water will result in system wide degradation of perfor­mance and solids may clog valves, strainers, flow regu­lators, etc. Additionally, the heat exchanger may become
clogged which reduces compressor service life or causes
premature failure.

Start-up

1. Open all valves to full open position and turn on power

to the conditioner.-

2. Set thermostat for “Fan Only” operation by selecting

“Off” at the system switch and “On” at the fan switch. If
“Auto” fan operation is selected, the fan will cycle with
the compressor. Check for proper air delivery.

3. For those units that have two-speed motors, reconnect

for low speed operation if necessary.

4. Set thermostat to “Cool.” If the thermostat is an automat

ic changeover type, simply set the cooling temperature
to the coolest position. On manual changeover types
additionally select “Cool” at the system switch.

Again, many conditioners have time delays which

protect the compressor(s) against short cycling. After
a few minutes of operation, check the discharge grilles
for cool air delivery. Measure the temperature differ
ence between entering and leaving water. It should be
approximately 11⁄2 times greater than the heating mode
temperature difference. For example, if the cooling
temperature difference is 15°F (8°C), the heating tem­perature difference should have been 10°F (5°C).

Without automatic flow control valves, target a cooling

temperature difference of 10°F to 14°F (5°C to 8°C).
Adjust the combination shutoff/balancing valve in the
return line to a water flow rate which will result in the

10˚F to 14°F (5°C to 8°C) difference.

5. Set thermostat to “Heat.” If the thermostat is the auto

matic changeover type, set system switch to the “Auto”
position and depress the heat setting to the warmest
selection. Some conditioners have built-in time delays
which prevent the compressor from immediately start­ing. With most control schemes, the fan will start imme
diately. After a few minutes of compressor operation,
check for warm air delivery at discharge grille. If this is

6. Set the loop water controller heat add setpoint to 70°F

-

-

-

-

-

(21°C) and the heat rejection setpoint to 85°F (29°C).
Supply power to all motors and start the circulating
pumps. After full flow has been established through all
components including the heat rejector (regardless of
season) and air vented and loop temperatures stabilized,
each of the conditioners will be ready for check, test and
start-up, air balancing, and water balancing.

a “cold building” start-up, leave unit running until return
air to the unit is at least 65°F (18°C).

Measure the temperature difference between enter

ing and leaving air and entering and leaving water. With
entering water of 60°F to 80°F (16°C to 27°C), leaving
water should be 6°F to 12°F (3.3°C to 6.6°C) cooler,
and the air temperature rise through the machine
should not exceed 35°F (19°C). If the air tempera
ture exceeds 35°F (19°C), then the water flow rate is
inadequate.

6. Check the elevation and cleanliness of the condensate
line. If the air is too dry for sufficient dehumidification,
slowly pour enough water into the condensate pan to
ensure proper drainage.

7. If the conditioner does not operate, check the following
points:

a. Is supply voltage to the machine compatible?
b. Is thermostat type appropriate?
c. Is thermostat wiring correct?

8. If the conditioner operates but stops after a brief period:

a. Is there proper airflow? Check for dirty filter, incor

rect fan rotation (3-phase fan motors only), or incor­rect ductwork.

b. Is there proper water flow rate within temperature

limits? Check water balancing; backflush unit if dirt­clogged.

9. Check for vibrating refrigerant piping, fan wheels, etc.

10. Do not lubricate the fan motor during the first year of
operation as it is prelubricated at the factory.

Field supplied relays installed on the input terminals W1, W2,

11.

Y1, Y2 or G may introduce electrical noise. Never install relay
coils in series with the inputs.

-

-

-

IM 742 / Page 7

Operating Limits

Environment

This equipment is designed for indoor installation only.
Sheltered locations such as attics, garages, etc., gener
ally will not provide sufficient protection against extremes in

Air limits Water limits

Cooling Heating Cooling Heating

Min. Ambient Air 50˚F/10˚C 50˚F/10˚C 40˚F/5˚C 40˚F/5˚C
Normal Ambient Air 80˚F/27˚C 70˚F/21˚C 80˚F/27˚C 70˚F/21˚C
Max. Ambient Air 100˚F/38˚C 85˚F/29˚C 100˚F/38˚C 85˚F/29˚C
Min. Ent. Air ➀➁ 50˚F/10˚C 50˚F/10˚C 50˚F/10˚C 40˚F/5˚C
Normal Ent. Air, 80/67˚F 70˚F 80/67˚F 70˚F

dw/wb 27/19˚C 21˚C 27/19˚C 21˚C
Max. Ent. Air 100/83˚F 80˚F 100/83˚F 80˚C

db/wb ➀➁ 38/28˚C 27˚C 38/28˚C 27˚C

Standard Range Units

Geothermal Range

Units

Additional Information For Initial Start-up Only

temperature and/or humidity, and equipment performance,

-

reliability, and service life may be adversely affected.

Geothermal Range

Cooling Heating Cooling Heating
Min. Ent. Water ➀➁ 55°F/13°C 55°F/13°C 30°F/-1°C 20°F/-6°C

Normal Ent. Water 85°F/29˚C 70˚F/21°C 77°F/25˚C 40˚F/5°C

Max. Ent. Water ➀➁ 110°F/43˚C 90°F/32°C 110°F/43˚C 90°F/32°C

➀ At ARI flow rate.
➁ Maximum and minimum values may not be combined. If one

value is at maximum or minimum, the other two conditions may
not exceed the normal condition for standard units. Extended
range units may combine any two maximum or minimum con­ditions, but not more than two, with all other conditions being
normal conditions.

Standard Range Units

Units

Standard Range units CCH & CRH

Units are designed to start-up in an ambient of 50°F (10°C),
with entering air at 50°F (10°C), with entering water at 70°F
(21°C), with both air and water flow rates used in the ISO
13256-1 rating test, for initial start-up in winter.
Note: This is not a normal or continuous operating condi­tion. It is assumed that such a start-up is for the purpose of
bringing the building space up to occupancy temperature.

Geothermal Range units CCW & CRW

Geothermal heat pump units are designed to start-up in an
ambient of 40°F (5°C), with entering air at 40°F (5°C), with
entering water at 25°F (-4°C), with both air and water at flow
rates used in the ISO 13256-1 rating test, for initial start-up
in winter.
Note: This is not a normal or continuous operating condi­tion. It is assumed that such a start-up is for the purpose of
bringing the building space up to occupancy temperature.

Operating voltages

115/60/1 . . . . . . . . . . . . . . . . 104 volts min.; 127 volts max.

208-230/60/1 . . . . . . . . . . . . 197 volts min.; 253 volts max.

265/60/1 . . . . . . . . . . . . . . . . 238 volts min.; 292 volts max.

230/50/1 . . . . . . . . . . . . . . . . 197 volts min.; 253 volts max.

460/60/3 . . . . . . . . . . . . . . . . 414 volts min.; 506 volts max.

380/50/3 . . . . . . . . . . . . . . . . 342 volts min.; 418 volts max.

575/60/3 . . . . . . . . . . . . . . . . 515 volts min.; 632 volts max.

Note: Voltages listed are to show voltage range. However,
units operating with overvoltage and undervoltage for
extended periods of time will experience premature com­ponent failure. Three phase system unbalance should not
exceed 2%.

Page 8 / IM 742

Typical Wiring Diagrams

Fan

Motor

070 - Blk
060 - Blk
048 - Red
042 - Blk
036 - Blk
030 - Blk

Compr

Motor

CC - Compressor Contactor
HTR - Crankcase Heater (Optional)
CAP - Motor Capacitor

Condensate

Sensor

Common

Fan

L1

Compressor

Reversing Valve
Solenoid (24 VAC)

0

W

2

G

W1Y

1

F E

L

U A

P

V

R C

Mark IV

PC

Board

Hi Pressure

Lo Pressure

Lo Temp

Ground

L1 L2

CC

Heater

Figure 8. Typical Mark IV/AC wiring diagram

COMPONENT LAYOUT

➀ COMPRESSOR CONTACTOR
➁ FAN CONTACTOR
➂ TRANSFORMER
➃ PC BOARD
➄ AUXILIARY RELAY
➅ CIRCUIT BREAKER

Notes:

1. Unit is factory wired for 208V operation. If 230V power supply is used,
transformer must be rewired by disconnecting the power lead from the
red transformer primary wire and connecting the power lead to the orange
transformer primary wire. Place an insulation cap on the red transformer
primary wire.

2. All temperature and pressure switches are normally closed.

3. Component layout shown below is typical. Some components may not be
used on this model or voltage.

4. Mark IV/AC controller board contains a static sensitive microprocessor.
Proper grounding of field service personnel should be observed or dam­age to controller may result.

5. Terminal block on Mark IV/AC board provides 24 VAC at terminals R and
C. All other outputs are 24 VDC.

6. Field supplied relays installed on the input terminals (W1, W2, Y1 or G) may inter-

fere with proper unit operation. Never install relay coils in series with inputs.

7. For more information pertaining to the Mark IV/AC controller, refer to
OM120.

IM 742 / Page 9